Im 6' and 180 LB what kind of dirt bike should i get?

Don't get a fast bike! Someone already mentioned it, but start small.. baby steps. You'll get injured on your first bike, and will most likely crash it (trust me, you will). By a good running bike (older = cheaper) like a Yamaha, Suzuki or Honda, and hop on! Don't spend more than $600, because you WILL tear up your first bike. And buy good protective gear! The sky is the limit. Minimalist gear I would buy full faced helmet and armored gloves, but I would also encourage you to get a padded jacket and pants too.